Nuclear Snail1 also becomes poly‐ADP‐ribosylated by interacting with the chromatin‐bound enzyme poly‐ADP‐ribose polymerase 1 (PARP‐1), which also prolongs the stability and nuclear residence of Snail1, thus contributing to breast cancer EMT and invasiveness (Rodriguez et al., 2011). Here, SNAI1 is linked to breast cancer.